CPU stays high even when add-on is idle
The add-on keeps one or more CPU cores busy at high load even when idle, disabled, or with no tabs in use.
Tier I · Proven The best-established problems.
24 public reports · first reported 8 November 2024 · last reported 8 October 2026
What's going wrong
Many Firefox users say this CORS header add-on keeps one or more CPU cores busy all the time, even with no browsing, with the feature switched off, or after a Firefox update.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 24 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.